Magazine for lead pencils



Patented July 28, .1936

UNITED smi-Esv PATENT OFFICE l Applicatioli:x January 29, 1934, Serial No. '108,802v

January 31, 1933 s claims. (calze-z2) This invention relates to a magazine for mechanical or magazine lead pencils, in which the projection of the leads is effected by means of lpressure brought to bear upon the pencil cap.

In such pencils the lead reposes in a magazine, from which it is led into a guiding-tube within the middle part of the pencil sleeve. From there it enters into the front part of the pencil, containing the lead-projecting device.

According to experience, in mechanical pencils oi' this type the introduction of the leads from the magazine into the guiding-tube within the middle part of the pencil tube presents peculiar diiiculties, since during this introduction jamming, e. g. by the crossing of the leads, etc.,

`easily occurs. The leads are disposed side by side in large numbers under the pencil-cap. They are therefore easily jammed during their introduction into the filling-tube. 'I'his jamming, strangely enough, takes place, as the inventor observed,

'when the bottom of the magazine is funnel- `of other organs e. g. resilient parts introduced into the magazine-space when the cap moves.

Furthermore the lead-bottom itself can e. g. be

jointed flexibly with the cap or can be formed exibly so that by the movements of the cap it changes its form.

The end of the filling-tube may also be shaped 1 shovel-like or screw-shaped and extend a little through the lead-bottom into the magazine. It may also be arranged movably with respect to the lead-bottom in such a manner that it enters into the lead-space by pushing the lead-bottom. In this case the shovel-like end of the llingtube forms the connecting-part between the magazine and the filling-tube. and acts upon the leads.

'I'he movement of the magazine-bottom, or of' the llin'g-tube, or of both, may be limited by suitable projections. v

y In the accompanying drawing several ways are shown in which the invention may be constructed. Fig. 1 shows a mechanical lead pencil with the new mechanism according to 'the invention in longitudinal section.

Fig. 2 shows the magazine constructed according to Fig. 1, when the pencil-cap is pressed downwards.

Fig. 3 shows a modified construction of the4 magazine in longitudinal section.

Fig. 4 shows a section on the line A-B in Fig. 3.

Fig. 5 shows a further' form of construction of the magazine. l

Fig. 6 shows a section on the line C-D in Fig. 5,.

Y Fig. 7 shows the construction of the magazine according to Fig. when the pencil-cap is pressed downwards. f

Fig. 8 shows a further form of construction of 15 the magazine and of the mechanism forthe-introduction of the leads into the llng-tube.

Referring to the drawing: vIn Fig. 1,-I refers to the case or outer surface of the pencil, which may be Vmade from a variety of materials, e. g.

metal, vulcanite, or an articial mass. In this shaft I is xed a tube 2, into which is slidably guided a sleeve 3 for the reception of the pencil leads 4- On the sleeve 3 is screwed, e. g., a nut 5, into which nut is screwed a closing-piece 8, with a grasping-cap 'I. With-the sleeve 3 is connected a ring-shaped part 8, whose upper funnelshaped surface I0 forms the bottom of the leadmagazine. To the ring-body 8 is joined the :dlling-tube I I, into which the leads 4 are introducedl from the magazine-space. According to Fig. 1 the lead 4' has e. g. only its smaller end in the magazine-space, while the larger part is already in the filling-tube II. The lead 4" is already completely in the lling-tube, and the lead 35 in the foremost part of the lling-tube, in the so-called clamping-device I2. 'Ihe foremost end of the lead 4"' is appearing through the opening I3 of thepencil point I4, so that the pencil is ready for writing.

The propelling mechanism may be of a very varied nature. In the above-described case it consists of a spring I5, one end of which rests upon the ring-shaped body 8, while the other end of this spring rests on the ring I6,'which is iirmlv fastened to the point-casing I6. To eiect the propelling of the leads there is also arranged upon the conically shaped part I1 of the clampingdevice directed towards the pencil-cap, a loose ring I8, which when the lling-tube II and the clamping-device I2, I1 are pushed forward, moves forward with them until it strikes against the projection I9varranged within the point-casing.

The foremost part of the clamping-device I2 is furthermore provided with slots 20, so that at its lmay spread sideways.

front end separate resilient cheeks are formed.

The propelling of the leads in such a mechanical or magazine pencil is effected in such a manner that pressure is exercised on the caps 6, 1 in the direction of the arrow, and the cap is brought into the position seen in Fig. 2.' The pencil case 3, together with the ring-body 8 and the illlingtube II, is also pushed towards the pencil-point as shown in Fig. 2. By this movement a` correspondingly longer portion of the lead 4"' is projected at the same time from the point I4. The spring I5 is by this forward movement pressed together. When the cap 6 hasbeen freed the pressure of the spring I5 guides the case II and 4",', now in an advanced position, is released. When the lling tube II and the clamping-device I2, I1 are guided back by the action of the spring I5, due to the spread condition of the cheeks I2 thelead 4 ris not guided back with them, but

- `remains in its advanced position, being held back in the resilient point-opening I3. Only lwhen the clamping-ring I8, carried along by the surface IT, strikes against the ring I6 and settles rmly upon the conical surface I1, is the lead again clamped. As a result the lead, which has been pushedforwards, remains partly in this forward position. Y

'I'he above-described propelling mechanism is not the object of this invention. The propelling mechanism may be constructed in any manner desired.

This application is solely concerned with the ranged within the same. When pressure is exer-` cised upon the cap 1, the resilient parts 2I, pass from the position shown in Fig. 1 into the position shown in Fig. 2, so that they do not move sideways. These movements are passed on to the store of leads 4 and loosen it in such -a manner that the introduction of a new `lead into the lling-tube II is thereby facilitated.

According to Figs. 3 and 4 the walls of the magazine 3 are vprovided with a slanting slot 23, into which enters a peg or projection 24 fastened either to the sleeve 2 or to the outer wall I. The walls ofthe magazine 2 are also provided with two or more projections or wings 25, 26, 21,

directed inwardly. 'Ihe .width of these projections or wings may be suitably varied as required. When pressure is exercised on cap 1 by a magazine shaped as shown in Fig. 3, since the slot 23 must slide alongside the peg 24, the magazine walls 3 turn with the cap 1. 'I'he turning of the magazine walls 3 is transmitted to the leads within the mechanism by the inwardly vprojecting wings 25, 26, 21, so that the former are brought into movement and loosened.

By this means the lead According to Figs. 5 and 6 the lead-bottom is attached to the filling-tube II and is divided by various slots 28,229 etc. into separate tongues 30, 3| etc. The lead-bottom is held by the turnedover edge 32 of the sleeve 3, so that the different tongues 30, 3I etc. bend, for example tilt outwardly, when pushing the sleeve.' A slight shaking of the store of leads, which facilitates the sliding of the lead into the filling-tube, is .caused by this change of shape of the magazine bottom during the pushing of the cap and its drawing back.

Fig. 7 shows the lead-bottom according to Fig. 5 in the position into which it is brought by the pushing of the cap 1.

According to Fig. 8 the lling-tube 33 is not rigidly attached to the ring-body 34, which similarly to the ring-body 8 in Fig. 1 is rmly fastened to the magazine-walls 3.1 The nlling-tube 33 is arranged movably in the ring-body 34. At the same time the outside of the lling-tube is provided with projections 35, 36, which during the backwardand forward-movement of the cap are engaged by corresponding projections 31, 38 of the ring-body 34. The upper part of the filling-tube 33 arr'anged movably approximately at the level of the magazine bottom is suitably formed shovel-shaped. The shovel-point 39, which extends slightly into the magazine-space 40, in order to keep back the leads on one side from the lling-tube, penetrates farther into the magazine-space 39 when the cap is pressed downwards. 'Ihe shovel-point thus turns aside any leads blocking .the point of entrance and facilitates the sliding of a single lead into the lling tube.

The form of the present invention may be altered in different ways within the scope of the main idea. In accordance with the invention the form of a, magazine for automatic lead pencils, in which the forward movement of the cap is transmitted to the leads by the movement of some connecting organ, may be used in connection with any form of propelling mechanism.-

The magazine-bottom, the illling-tube and other details of the device may be formed as desired. It has been shown to be advantageous if the conical widening at the upper end of the lling tube measure only slightly less than twice the diameter of the leads.v The passing-in of the leads l is also facilitated by such form and measurement, f

since thus. only one lead ata time can pass into the widening.

Having now particularly described and ascertained the nature of my said invention and inw what manner the same is to be performed, I dev clare that what I claim is:-

1. A mechanical pencil of the type inwhich leads are fed`in succession from a lead supply magazine, comprising a casing, a lead supply@ magazine mounted for reciprocatlon back and forth within said casing, means accessible `from the exterior of said casing adjacent the rear end thereof for reciprocating said magazine within said casing, and means movable within said magil azine and operated by mo'vement of said magazine for-disturbing the relative positions of various leads within said magazine,

2. A mechanical pencil of the type inwhich leads are fed in succession from a lead/supply 7 magazine, comprising a casing, a lead supply magazine mounted for reciprocation back and forth within said casing, means accessible from the exterior of said casing adjacent the rear end thereof for reciprocating said magazine within 7l said casing, a lead guiding tube operatively connected to said magazine to receive leads singly therefrom, and means for causing said tube. upon movement of said magazine, to move within said 5 magazine to displace leads therein to facilitate the feeding of individual leads to said tube.

3. A mechanical pencil comprising a casing, lead feeding mechanism within said casing, a lead supply magazine mounted for movement l0 back and forth within said casing, a cap at the rear end of said casing operatively connected to said magazine sol that said magazine may be moved forwardly within said casing by pushing upon said cap, means connecting said magazine to said lead feeding mechanism to operate said mechanism to feed a lead forwardly upon forward movement of said magazine, and flexible means associated with said magazine and deformable upon movement of said magazine with said casing, for disturbing the relative positions of various leads within said magazine.

4. A mechanical pencil comprising a casing, lead feeding mechanism within said casing, a lead supply magazine mounted for movement-back and forth within said casing, a cap at thel rear end of said-casing operatively connected to said magazine, so that said magazine may be moved forwardly within said casing by pushing upon said cap, a lead guiding 'tube leading from said magazine to said lead feeding mechanism, and a loose connection between said guiding tube and said magazine so that when said cap and magazine are moved forwardly with respect to said casing, said tube may move intosaid .magazine to disturb the relative positions of various leads therein. I

5. A- mechanical pencil comprising a casing, lead feeding mechanism within said casing, a lead supply magazine mounted for movement back and forth within said casing, said magazine having a forward end with an aperture therethrough,

a cap accessible externally of said casing adjacent the rear end thereof and operatively connected to said magazine so that said magazine may be moved forwardly within said casing by pushing upon said cap, a lead guiding tube entering said aperture in said magazine and leading thence to said lead feeding means, said guiding tube being movable longitudinally in said aperture, and stop means limiting the extent of longitudinal movement of said tube with respect to said magazine, so that upon movement of said magazine in a forward direction said magazine 5 will rst move forwardly with respect to said tube and the rear end of said tube will enter said magazine to displace leads therein, and continued forward movement of said magazine will carry said tube along with it, 10

6. A mechanical pencil comprising a casing. lead feeding mechanism within said casing, a lead supply magazine mounted for movement back'and forth within said casing, said magazine having a forward end with an aperture therel5 through, a cap accessible externally of said casing adjacent the rear end thereof and operatively connected to said magazine so that said magazine may be moved forwardly within said casing by pushing upon said cap, and a lead guiding tube 20 longitudinally movable through a limited range in said aperture in said magazine and leading thence to said lead feeding means, said guiding tube being movable for a limited distance into said magazine upon forward movement of said 25 magazine. i

7. A construction according to claim 6, in which the end of said guiding tube movable into said magazine is provided with a rounded shovellike point on one side. 30

8. A mechanical pencicompris'ing a casing, lead feeding mechanism within said casing, a lead supply magazine mounted for movement back and forth within said casing, a cap at the vrear end of said casing operatively connected to said 35 magazine so that said magazine may be moved forwardly within said casing .by pushing uponsaid cap, means connecting said magazine to said lead feeding mechanism to operate said mechanism tofeed a lead forwardly upon forward move- 4 9 ment of said magazine, and means movable in the interior of said magazine and moved by movement of said magazine within said casing for disturbing the relative positions of various leads within said casing. 45

AUGUST 

